kicad-developers team mailing list archive

[Carl Poirier <carl.poirier.2@xxxxxxxxx>]

So in this case, let's keep what was said before; origin in the middle of
SMT, origin on pin one of THT, which is put in the first quadrant.

Are there any opinions about schematics using millimeters, which I
mentioned earlier?

Carl


On Sat, Apr 19, 2014 at 6:15 PM, Cirilo Bernardo
<cirilo_bernardo@xxxxxxxxx>wrote:

> > From: Carl Poirier <carl.poirier.2@xxxxxxxxx>
> >To: KiCad Developers <kicad-developers@xxxxxxxxxxxxxxxxxxx>
> >Sent: Saturday, April 19, 2014 11:15 AM
> >Subject: [Kicad-developers] Library Convention
> >
> >
> >
> >Hi developers,
> >
> [snip]
> >
> >1. Is a device that's made by many manufacturers and sold in tubes, tapes
> or trays always in the same orientation?
> No.
>
> >2. For automatic insertion of THT components, where should the origin
> point be put? Jean-Paul Louis was saying to me it should be on pad 1, so is
> it always the case?
> >
> No.
>
> These are not really issues for the EDA; they are issues to be discussed
> with the PCB manufacturers. For the orientation of SMT devices, use one of
> the existing standards; you can even use a standard package orientation
> when the actual manufacturer does not place the pins according to the
> standard. The pick/place machines don't care about pin numbering, only
> about fiducial marks on the board and component orientation in the
> tray/whatever.
>
> Creating numerous orientations of footprints will only confuse matters.
>
> For THT, once again any orientation issues should be discussed with the
> specific manufacturer. The THT world is even worse than the SMT world; at
> least for SMT there are (multiple) standards even though in many cases the
> standards are not followed.
>
> - Cirilo
>